*) dsn_lasthop switch added for routers
*) if dsn_lasthop is set by a router it is handled as relaying to a
non DSN aware relay. success mails are sent if Exim successfully
*) dsn_lasthop switch added for routers
*) if dsn_lasthop is set by a router it is handled as relaying to a
non DSN aware relay. success mails are sent if Exim successfully